Is there supposed to be a picture??
But to answer ur question when ur referring to x your referring to 1 hope this helps
Answer:
if 1 in= 10 miles, then, 8 in= 80 miles
Step-by-step explanation:
Complete the math in the brackets (4a + 1)
Multiple each term in the brackets by 4a
4a (8a - 4a + 1)
4a (4a + 1)
16a^2 + 4a